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oai:drum.lib.umd.edu:1903/261482022-03-12T09:40:19Zcom_1903_11812com_1903_12com_1903_2col_1903_2752col_1903_3

Wang, YuHuang Li, Yunfeng Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Chemistry 2020-07-09T05:33:09Z 2020-07-09T05:33:09Z 2020 https://doi.org/10.13016/qc1j-hnpc http://hdl.handle.net/1903/26148 Ultrashort single-walled carbon nanotubes (SWCNTs) that fluoresce brightly in the shortwave infrared shows great potentials in bioimaging, sensing and enabling room-temperature, solid-state single-photon sources. However, this novel family of materials remains largely unexplored due to the synthetic challenge. In this thesis, I will introduce a high-yield synthesis method of fluorescent ultrashort nanotubes based on a fundamental new understanding of defect-induced chemical cutting of SWCNTs. The method includes implanting fluorescent quantum defects onto the carbon nanotubes, and then cutting the nanotubes preferentially from the defect sites. Firstly, I demonstrate that this simple two-step process leads to the synthesis of ultrashort nanotubes with a narrow length distribution and fluorescence in the shortwave infrared. Then, I will further elucidate the mechanism of this defect-induced chemical cutting at the molecular level for the first time by in-situ monitoring the spectral fingerprint of the nanotube and the fluorescent quantum defect as the reaction proceeds. This thesis reveals fundamental insights in defect chemistry and makes fluorescent ultrashort nanotubes synthetically accessible for both basic and applied studies. en FLUORESCENT ULTRASHORT NANOTUBES FROM DEFECT-INDUCED CHEMICAL CUTTING Thesis Chemistry Fluorescent Quantum Defect Nanotube Cutting Single-Walled Carbon Nanotube Ultrashort embargo